Left-hander Wei-Yin Chen (pictured) was on his way to his second strong performance in a row when he grabbed at his side and exited Sunday's game with a right oblique strain. That's very bad news for a team that already has called on four Triple-A starters to fill in the fifth slot in the rotation and replace injured Miguel Gonzalez. It was a tough week already, after so-so outings by Jason Hammel, Freddy Garcia and Steve Johnson, and that was reflected in the combined numbers. The rotation posted a 2-2 record with a 6.03 ERA and averaged just five innings per start. Even though the team managed to go 4-2 in those games, this is starting to get scary.
Grade: D (Hannah Foslien / Getty Images /May 12, 2013)
In order to make room for Markakis on the 25-man roster, the Orioles optioned first baseman Joe Mahoney back to Triple-A Norfolk.
Markakis was placed on the DL for the first time in his career June 1, retroactive to May 30, with a right hamate bone fracture. He was 3-for-10 with two home runs and four RBIs during the rehab assignment with the Baysox.
Before the injury, Markakis batted .256 with eight homers and 26 RBIs in 50 games for the Orioles. He will rejoin the team for the start of the second half Friday night against the Detroit Tigers at Camden Yards.
Mahoney was 0-for-3 in his major league debut Saturday night against the Los Angeles Angels. He is batting .257 with 14 doubles, five home runs and 38 RBIs in 84 games for the Tides this season.




